[HBASE-2883] Req/sec in web UIs are way off when regions are moving

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Invalid
• Affects Version/s: 0.20.5, 0.89.20100621
• Component/s: metrics
• Assignee: Unassigned
• Reporter: Jean-Daniel Cryans
• Created: 27/Jul/10 18:56
• Updated: 12/Jun/22 00:01
• Resolved: 07/May/13 22:48

Description

Now that the region servers can heartbeat back to the master as soon as they have a message (region open, close, etc), they also recompute their metrics. I see two problems:

• The metrics are recomputed way too often, and by the looks of that code it seems quite intense.
• Our UIs are expecting that the value returned by the metrics computation is per second, but when regions are moving a RS can ping back a few times within a single second. This gives a very wrong view of the load.

I think it's time we move metrics computation in it's own separate thread.